first of all thank you for your answer.

When I start the wallet on local computer and then go to the "Masternode" tab its empty. Nothing is listed.

But when I check the IP of my masternode on Scrypto.io https://scrypto.io/s/mns-syndicate/
it tells me its active.

When I go to "Help"- > "Debug window" and then type in "Masternodelist" it shows the active Masternodes. I searched for my Transaction ID of my Masternode but its not in the list.

Then I again type on "create" and typed the Alias, Adress, privkey, TxHash,Output Index. (Like yesterday)

and it showes now "Masternode is Running"

Now I again typed into Debug window "Masternodelist" and now mine is in the list.

When I restart wallet it disappeard again...

___
What do you mean with Typing in into masternode.config file?
I checked the file. There are 4 Lines all the same. My Masternode with IP, txid, privkey....

4 times... Shall I delete the other 3 ?